You can use the formula c = 60m + 35 for this. c is the cost and m is the number of months. Since a year is 12 months, 60m = 60*12 = 720. Then add the one time fee of $35. 720 + 35 = 755.
To find range you have to put them in order from least to greatest then subtract the greatest number from the smallest number which would be 2 subtracted from 53 which is 51.